Apparatus and method for utilizing thermal energy

A method of operation of a given kinetic energy harvester, comprising:

• feeding a first heat carrier under pressure into the given kinetic energy harvester toward a first convergent nozzle;
• and,
• feeding a second heat carrier into the given kinetic energy harvest upstream of and toward a second convergent nozzle, the second heat carrier being colder than the first heat carrier, the second nozzle being downstream of the first nozzle in the given kinetic energy harvester, and mixing the first heat carrier and the second heat carrier in a mixing chamber between the first nozzle and the second nozzle to produce a two-phase mixture;
• wherein a conversion is carried out with the two-phase mixture, the conversion including:
• in the mixing chamber between the first nozzle and the second nozzle, causing a pressure drop and deceleration of the two-phase mixture to a velocity at which the two-phase mixture or at least one of the first heat carrier or the second heat carrier boils with formation of the two-phase mixture being highly compressible with small bubbles and with a Mach number of more than 1;
• collapsing the small bubbles via the second nozzle to change the two-phase mixture into a single-phase flow medium having increased kinetic thrust downstream of the second nozzle as compared to the two-phase mixture;
• and
• discharging the single-phase flow medium having the increased kinetic thrust from an exit of the given kinetic energy harvester downstream of the second nozzle by discharging the single-phase flow through a converging discharge section at the exit of the given kinetic energy harvester.